condition mean min max ZT0-3 2.51336642025 1.7594124844999999 3.2673203560000004 ZT4-7 2.24830408475 1.9463079945000001 2.5503001750000003 ZT8-11 4.000576832249999 3.802958383 4.198195281499999 ZT12-15 4.3523961655 3.4427272835 5.2620650475 ZT16-19 4.99576281025 4.0564618795000005 5.935063741 ZT20-23 5.36710964525 5.198550770000001 5.5356685205